How do I find the technical name for a function so I can assign a hotkey to it?
You can turn on Python Tooltips in User Preferences >
Interface > Display. Hover over the tool or button you
want to assign a shortcut for and the function (operator) name appears. 



Then press CtrlC to copy that operator call and paste it into blenders python console CtrlV. Remove the brackets, type .idname_py() and press Enter to get the python identifier of the operator, which can be used to create or edit shortcuts in User Preferences > Input.



Example: bpy.ops.object.origin_set(type='ORIGIN_CURSOR') 
Python identifier: object.origin_set